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File Edit View History Bookmarks People Window Help CH 27 Hw ps:isession masteringphysics.com/myct/temivView assignmentProblemiD- 86777433 Problem 27.55 CH 27 H P, Problem 27.55 Part A You need to design a 1.0 A fuse that "blows" if the current exceeds 1.0 A. The fuse material in your stockroom melts at a current density of 450 A/cm2 What diameter wire of this material will do the job? Express your answer to two significant figures and i oblem A Stretch D 0.0532 m Problem Submit My Answers Give Up Problem Incorrect; Try Again; 3 attempts remaining 6. Problem 17.Problem 18. Problem

Explanation / Answer

We know that

J = I / A

Now we get

I = J * A

so

A = I / J

=(1 A) / (450 A/cm^2)

=2.222*10^-3 cm^2

Now

Area = PI*radius^2

2.222*10^-3 cm^2= (3.14159)*radius^2

=0.003cm =0.03mm

Diameter is twice the radius: d = 2*radius = 2*0.03 mm=0.06mm

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